<template>
    <div id="root">
        <div class="todo-container">
            <div class="todo-wrap">
            <MyHeader @receive="receive"></MyHeader>
            <MyList :todos="todos"></MyList>
            <MyFooter :todos="todos" @checkAllTodo="checkAllTodo" @clearAllTodo="clearAllTodo"></MyFooter>
            </div>
        </div>
    </div>
</template>

<script>
    import pubSub from 'pubsub-js';
    import MyHeader from './components/MyHeader.vue';
    import MyFooter from './components/MyFooter.vue';
    import MyList from './components/MyList.vue';
    export default {
        name:'App',
        components:{MyHeader,MyFooter,MyList},
        data(){
            return{
                todos:JSON.parse(localStorage.getItem('todos')) || []
            }
        },
        methods:{
            //添加一个todo
            receive(x){
                // console.log('App组件受到了数据',x)
                this.todos.unshift(x)
            },
            //取消勾选一个todo
            checkTodo(id){
                this.todos.forEach((todo)=>{
                    if(todo.id===id) todo.done = !todo.done
                })
            },
            deleteTodo(_,id){
                this.todos = this.todos.filter((todo)=>{
                    return todo.id !==id
                })
            },
            checkAllTodo(done){
                this.todos.forEach((todo)=>{
                    todo.done = done
                })
            },
            clearAllTodo(){
                this.todos = this.todos.filter((todo)=>{
                    return !todo.done
                })
            },
            updateTodo(id,title){
                this.todos.forEach((todo)=>{
                    if(todo.id===id) todo.title = title
                })
            }
        },
        watch:{
            todos:{
                deep:true,
                handler(value){
                    localStorage.setItem('todos',JSON.stringify(value))
                }
            }
        },
        mounted(){
            this.$bus.$on('checkTodo',this.checkTodo)
            // this.$bus.$on('deleteTodo',this.deleteTodo)
            this.pubId = pubSub.subscribe('deleteTodo',this.deleteTodo)
            this.$bus.$on('updateTodo',this.updateTodo)
        },
        beforeDestroy(){
            this.$bus.$off('checkTodo')
            // this.$bus.$off('deleteTodo')
            pubSub.unsubscribe(pubId)
            this.$bus.$off('updateTodo')
        }

    }
</script>

<style>
    /*base*/
    body {
    background: #fff;
    }

    .btn {
    display: inline-block;
    padding: 4px 12px;
    margin-bottom: 0;
    font-size: 14px;
    line-height: 20px;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2), 0 1px 2px rgba(0, 0, 0, 0.05);
    border-radius: 4px;
    }

    .btn-danger {
    color: #fff;
    background-color: #da4f49;
    border: 1px solid #bd362f;
    }
    .btn-bianji {
    color: #fff;
    background-color: #18b234;
    border: 1px solid #068a23;
    margin-right: 3px;
    }

    .btn-danger:hover {
    color: #fff;
    background-color: #bd362f;
    }

    .btn:focus {
    outline: none;
    }

    .todo-container {
    width: 600px;
    margin: 0 auto;
    }
    .todo-container .todo-wrap {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    }

</style>